package org.crown.common.utils;

import javax.servlet.http.HttpServletRequest;

public class IpAddr {

    /**
     * Get IP  With Nginx
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        //如果有多层代理，第一个ip为真实客户端ip
        if (null != ip && ip.split(",").length >= 2) {
            ip = ip.split(",")[0];
        }
        return ip;
    }
}
